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Compare the present form and will + (verb)

The present form simply refers to the present-future, and is often used for general statements.

We use will when there are options or possibilities.
The future is often unknown, so we consider possibilities and choose what we think will happen (we make predictions).
We also consider options and choose what we will do (we make decisions).

It’ll rain a lot in summer. (considering possibilities, what we think will happen – a prediction, next summer)
I won’t eat lunch at work today, I’ll go to the park. (considering options – what I choose to do – a decision)Willyou buy her flowers for her birthday? (considering options – what you choose to do – a decision)

However, we don’t need to add will to talk about the future.

We use the present form for fixed events in the future (these things can’t be changed). We say or know when they happen.

We use will + (verb) when we consider options or possibilities and a choice is made(the future is unknown, so we say what we think will happen).

The package arrivestomorrow. (A fixed future event – scheduled)
We don’t have a game next week. (the schedule)
What time doyou start work on Friday? (your schedule)

The package will arrive tomorrow. (The package could possibly arrive on a different day, the speaker is saying what they think.)
We won’t have a game next week. (It was possible, but it won’t happen. Maybe there was a change of plan, or someone cancelled.)
What time willyou start work on Friday? (Considering that there are several times you may possibly start work)

When we talk about the present, we often don’t think about other possibilities and simply use the present form.

But sometimes when we talk about the present, we use will + (verb) if there are other possibilities.

(phone ringing) It’s my husband. (A fact. Maybe I looked at the screen and saw who was calling, or he told me he’d call at this time.)

(phone ringing) It’ll be my husband. (It could possibly be someone else, I’m saying who I think it is.)

Also, when we make general statements, we can use willif there are other possibilities.

Water will boil at a lower temperature at higher altitudes. (most people know that water boils at 100°C, but using will emphasizes that there are other possibilities)
Accidents will happen. (In general, we know it is not possible to stop all accidents from happening.)

Sometimes the meaning of willchanges the meaning a lot.

If she doesn’t call, we’ll go without her. (simply, she doesn’t call, maybe she forgot)

If she won’t call, we’ll go without her. (she considers her options and decides not to call – she refuses to call us)

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